This ruined 15th-century hermitage is steeped in myth and mystery.

The Mexican painter Diego Rivera created this unusual museum to display his collection of pre-Hispanic artifacts.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

Spend the night in this formerly abandoned traditional Scottish village.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

More than 100 Hindu temples are slowly being swallowed by the forest.

The singular ruins of a mysterious lost city.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

These biodiverse university gardens form a green oasis amid the urban chaos of Mexico City.

An off-grid art installation that encourages its visitors to imagine a world without waste.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

The second-oldest garden cemetery in the U.S. was also a college brainstorm spot of Stephen King.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

The oldest still-operating tavern in the United States was once owned by a pirate.

Home to one of the tallest church spires in Europe, this historic church once played host to King Henry VIII and Anne Boleyn.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The legendary building that needed ghostly approval before being built.

The fairy tale castle of the "fairy-tale king."